Attachment for sewing machines



April 30, 1940. R CUNMNG 2,198,591

- ATTACHMENT FOR SEWING MACHINES Filed Oct- 9, 1937 IN VENTOR.

ROBERT cu/v/w/vc 494191 J, aw

ATTORNEY.

Patented Apr. 30, 1940 1' UNITED STATES PA ENT OFFICE ATTACHMENT ron-SEWiNG MACHINES Robert Cunning; Endicott, N; Y. Application October 9,1937, Serial ,No. 168,288

,Z-Claims. (01. 112- 5);

This invention relates to' attachments for sewing machines and moreparticularly to attachments adapted for use with a sewing machineutilized in the'manufacture of leather goods.

One object of this invention is theprovision of an improved foot adaptedto be utllizedwith a sewing machineof the type used in making shoes.

A further object is the provision of..a foot for a sewing machine havinga blade associated therewith adapted to cut the material being sewedsimultaneously with the sewing thereof.

An additional object is the provision of such a blade so arranged thatthe samemay be readily removed or replaced.

A further and more specific object is the provision of such a bladewhich may be positioned with respect to the foot to provide a cut ofvariable depth.

A further and more specific object is the provision of a sewing machinefoot having a blade associated therewith particularly adapted to beutilized in sewing and cutting a groove, to simulate, in one piece ofleather, a toe piece and a top piece for moccasins.

As conducive to a clearer understanding of the objects of this inventionit should be pointed out that in a moccasin type shoe the toe iscomprised of two portions, a toe piece adjacent the last and a top piecesecured thereto. For various reasons such as economy in manufacture, itis sometimes desirable that the two members required to form thestandard design for this type of shoe be formed of one integral piece ofleather. In such cases a double line of stitching is usually providedalong that portion of the piece where the seam would be positioned weretwo separate pieces of leather utilized. 7

Subsequent to this stitching operation a out has hitherto been made inthe leather between the two lines oi stitching in order to simulate theappearance of two separate pieces of leather. Prior to applicant'sinvention this out has been made as a separate operation and customarilyby hand.

It is an object of this invention, therefore, to provide a mechanismwhich will perform the above described cutting operation simultaneouslywith the stitching operation thereby saving time and labor.

Other objects will in part be obvious and in part be pointed outhereinafter.

The invention accordingly consists in the comblnations of parts,arrangements of elements and features of construction all as will bemore fully pointed out hereinafter and shown in the accompanying drawingwherein:

Figure 1 is a side elevational view of one form of the inventive conceptdisclosing the same attached to a presser foot bar of a sewing machine,

Figure 2 is a front elevational view of the device shown in Figure 1 asviewed from the right,

Figure 3 is a sectional view of the device taken along the line 3-3 ofFigure 1 as viewed from the p.

Figure 4 is a bottom plan view taken substantially along the line 44 ofFigure 1, and

Figure 5 is a detailed view showing one of the elements comprising aportion of the invention.

Similar reference characters denote similar parts thoughout the severalviews of the drawing.

Having particular reference now to the drawing, there is generallyindicated at ill a sewing machine foot comprised of shank ii and a footportion l2.

Shank i l is provided with an aperture i2 which may be suitably threadedto accommodate a set screw [3 or other analagous securing means forsecuring the same to a suitable presser foot bar M, which may also beprovided with a threaded recess to engage the threaded portion of setscrew I 3. Thus the presser foot may be readily attached to or removedfrom the sewing machine as desired.

Foot portion l2 comprises a block of relatively substantial thicknessprovided at its upper extremity with a slot i3 extending the full lengththereof.

Slot l3 broadens into a groove l4 adjacent the base of the foot (seeFigure 2) which groove, is provided with cutaway portions l5 adjacentone end thereof, the purpose of which portions will be more fullydescribed hereinafter.

A blade i6 is positioned in slot i3 and held therein as by set screws I!which engage suitable threaded recesses in foot i2, as better shown inFigure 5, blade I 6 comprises an extending portion 20 substantially thelength of slot i3 and is provided with notches 2i positioned forcoaction with screws H. A cutting edge 22 projects downwardly from slotl3 into groove l4. Thus it will be seen that tightening of set screwsi'i compresses the sides of slot l3 against blade IE to hold the same inrelated assembly with slot I3 and that, due to the configuration ofnotches 2| the blade may be moved upwardly or downwardly to vary theposition of cutting edge 22 within groove M. It will additionally beseen that by releasing set screws I'I blade i6 may be readily removedfor replacement or sharpening or other desired purposes withoutextensive disassembly of the device.

An aperture 25 extends completely through foot I2 on opposite sides ofblade 16 and is designed to have passed therethrough a pair of needles26, one of which operates on either side of blade l6. 7

Now from the foregoing it will be seen that as a moccasin toe comprisinga single piece of leather is fed into foot l2 from the left, asviewed'in Figure 1, cutaway portions 15 compress a portion of theleather to form a ridge therein. Needles 26, operated in any desiredconventional manner, form a line of stitching on each side "of the ridgethus formed and cutting edge 22 of blade 16 simultaneously forms a cutor variable depth, depending on the positioning thereof, in the ridge ofleather between the rows of stitching, thus simulating a two piecemoccasin toe in one simple, rapid and emcient operation.

It will therefore be seen that there is herein provided a structurewhich accomplishes the objects of this invention, and others, includingmany advantages of great practical utility.

As many embodiments may be made of this invention, and as manymodifications may be made in the embodiment of the invention herein setforth, it is to be understood that all matter hereinbefore described orshown in the accompanying drawing is to be interpreted merely as il1ustrative and not in a limiting sense.

I claim as my invention:

1. In combination with a sewing machine having means for forming adouble row of stitching, a foot, means associated with said foot forforming a ridge in the material to be stitched and means associated withsaid foot for forming a cut in the stitched material in said ridgebetween said rows of stitching, said last-mentioned means comprising ablade having notchesjthe'rein carried by said foot and positionedbetween the paths of movement of said means for forming said dou- .blerow of stitching and means for ready replacement of said blade, saidlast mentioned means comprising releasable set screws mounted in saidfoot and engaging said notches in said blade.

2. An attachment for sewing machines comprising, in combination, a foot,means for securing saidfoot to said sewing machine. a groove in saidfoot, a removable blade secured in said groove, and means associatedwith said groove for forming a ridge in the material to be stitched andforcing said ridge against said blade, said last mentioned meanscomprising cutaway guide portions in said groove adjacent that end ofsaid groove into which said material is fed.

ROBERT CUNNIN G.

